Off-center shaft for a printer

Abstract

The utility model relates to an eccentric shaft for printer, including shaft body, first eccentric part, second eccentric part, the first eccentric part forms and is short of groove, the first eccentric part includes first chamfer part, first step part, second step part, second chamfer part and third step part, the short groove is from first chamfer part, first step part, second step part and second chamfer part in proper order and is passed to the left segment part of third step part, the inner wall of short groove is equipped with wear -resisting layer, the right side of third step part is connected shaft body through first inclined round table, the shaft body is electroplated with hard chromium layer, the right side of shaft body is connected second eccentric part through second inclined round table, first eccentric part and second eccentric part are located on same axis, the right side of second eccentric part is provided with fourth chamfer part, it ensures the stability when running subsequently, reduces vibration and noise, is favorable to ensure running reliability, also can improve the hardness of shaft body, also makes first eccentric part have stronger wear resistance, prolongs the service life of first eccentric part.

Description

Technical Field

[0001] This utility model relates to the field of eccentric shaft technology for printers, and in particular to an eccentric shaft for printers. Background Technology

[0002] Dot matrix printers are a special type of printer, and they differ greatly from inkjet and laser printers. This difference is irreplaceable by other types of printers. Because of this, dot matrix printers have always maintained their unique market share and serve some special industry users.

[0003] Dot matrix printers use 24 pins in the print head to strike carbon paper, creating characters. Users can choose from multiple sheets of paper, typically 2, 3, or 4 sheets, with some also using 6 sheets. Only dot matrix printers can quickly complete multi-sheet printing in one pass; inkjet and laser printers cannot.

[0004] The eccentric shaft of existing printers has poor wear resistance, resulting in a shortened lifespan for the eccentric part. Furthermore, the eccentric shaft of existing printers exhibits poor stability during operation.

[0005] Therefore, in this utility model patent application, the applicant has carefully researched an eccentric shaft for printers to solve the above-mentioned problems. Utility Model Content

[0006] The present invention addresses the shortcomings of the prior art by providing an eccentric shaft for a printer that ensures smooth operation, reduces vibration and noise, improves operational reliability, enhances shaft hardness, and gives the first eccentric portion strong wear resistance, thus extending its service life.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An eccentric shaft for a printer includes a shaft body and a first eccentric portion and a second eccentric portion located on the left and right sides of the shaft body, respectively.

[0009] The first eccentric part and the shaft are not on the same axis. A notch is formed on the front side of the first eccentric part. The first eccentric part includes a first chamfered part, a first step part, a second step part, a second chamfered part and a third step part arranged sequentially from left to right. The notch extends from the first chamfered part, the first step part, the second step part and the second chamfered part to the left section of the third step part. A wear-resistant layer is provided on the inner wall of the notch. The right side of the third step part is connected to the shaft body through a first inclined frustum.

[0010] The shaft body is electroplated with a hard chrome layer. The right side of the shaft body is connected to the second eccentric part through the second oblique truncated cone. The second eccentric part and the shaft body are not on the same axis. The first eccentric part and the second eccentric part are located on the same axis. The right side of the second eccentric part is provided with a fourth chamfer.

[0011] As a preferred embodiment, the first and second inclined frustums are arranged symmetrically.

[0012] As a preferred embodiment, the outer diameters of the first eccentric portion and the second eccentric portion are the same.

[0013] As a preferred embodiment, the right end face of the first inclined frustum is inclined to the right from top to bottom.

[0014] As a preferred embodiment, the left end face of the second truncated cone is inclined from top to bottom to the left.

[0015] As a preferred embodiment, the outer diameters of the first step portion and the third step portion are equal, and the outer diameter of the second step portion is smaller than the outer diameter of the first step portion.

[0016] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, it mainly ensures the smoothness of subsequent operation and reduces vibration and noise by having the first eccentric part and the second eccentric part located on the same axis, which is conducive to ensuring operational reliability. Moreover, the hard chrome layer can improve the hardness of the shaft body. At the same time, the wear-resistant layer is provided on the inner wall of the groove, which makes the first eccentric part have strong wear resistance and extends the service life of the first eccentric part.

[0017] To more clearly illustrate the structural features and effects of the present invention, a detailed description is provided below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 Enlarged structural diagram at point A in the middle.

[0020] Explanation of icon numbers:

[0021] 10. First eccentric part 101. Groove notch

[0022] 11. First chamfer section 12. First step section

[0023] 13. Second step section 14. Second chamfer section

[0024] 15. Third step section 16. First inclined frustum

[0025] 20. Shaft body; 21. Second oblique frustum

[0026] 30. Second eccentric part; 31. Fourth chamfered part. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 and Figure 2 As shown, an eccentric shaft for a printer includes a shaft body 20 and a first eccentric portion 10 and a second eccentric portion 30 located on the left and right sides of the shaft body 20, respectively.

[0029] The first eccentric portion 10 and the shaft 20 are not on the same axis, and a notch 101 is formed on the front side of the first eccentric portion 10.

[0030] The first eccentric portion 10 includes a first chamfered portion 11, a first stepped portion 12, a second stepped portion 13, a second chamfered portion 14, and a third stepped portion 15 arranged sequentially from left to right. The outer diameters of the first stepped portion 12 and the third stepped portion 15 are equal, and the outer diameter of the second stepped portion 13 is smaller than the outer diameter of the first stepped portion 12.

[0031] The notch 101 extends sequentially from the first chamfered portion 11, the first step portion 12, the second step portion 13, and the second chamfered portion 14 to the left section of the third step portion 15. A wear-resistant layer 16 is provided on the inner wall of the notch 101.

[0032] The right side of the third step portion 15 is connected to the shaft 20 via the first inclined frustum 16; the length of the shaft 20 is at least three times the length of the third step portion 15.

[0033] The shaft 20 is electroplated with a hard chrome layer, and the right side of the shaft 20 is connected to the second eccentric portion 30 via a second inclined frustum 21. The first inclined frustum 16 and the second inclined frustum 21 are symmetrically arranged. The right end face of the first inclined frustum 16 is inclined from top to bottom to the right, and the left end face of the second inclined frustum 21 is inclined from top to bottom to the left.

[0034] The second eccentric portion 30 and the shaft 20 are not on the same axis, while the first eccentric portion 10 and the second eccentric portion 30 are on the same axis. The outer diameters of the first eccentric portion 10 and the second eccentric portion 30 are the same, and the length of the first eccentric portion 10 is greater than the length of the second eccentric portion 30. Preferably, the length of the first eccentric portion 10 is at least three times that of the second eccentric portion 30. A fourth chamfered portion 31 is provided on the right side of the second eccentric portion 30.

[0035] The key design feature of this utility model is that the first eccentric part and the second eccentric part are located on the same axis, which ensures the stability of subsequent operation, reduces vibration and noise, and helps to ensure operational reliability. Moreover, the hard chrome layer can improve the hardness of the shaft, and the wear-resistant layer is provided on the inner wall of the groove, which makes the first eccentric part have strong wear resistance and extends the service life of the first eccentric part.

[0036] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. An eccentric shaft for a printer, characterized in that: It includes a shaft and a first eccentric part and a second eccentric part located on the left and right sides of the shaft, respectively; The first eccentric part and the shaft are not on the same axis. A notch is formed on the front side of the first eccentric part. The first eccentric part includes a first chamfered part, a first step part, a second step part, a second chamfered part and a third step part arranged sequentially from left to right. The notch extends from the first chamfered part, the first step part, the second step part and the second chamfered part to the left section of the third step part. A wear-resistant layer is provided on the inner wall of the notch. The right side of the third step part is connected to the shaft body through a first inclined frustum. The shaft body is electroplated with a hard chrome layer. The right side of the shaft body is connected to the second eccentric part through the second oblique truncated cone. The second eccentric part and the shaft body are not on the same axis. The first eccentric part and the second eccentric part are located on the same axis. The right side of the second eccentric part is provided with a fourth chamfer.

2. The eccentric shaft for a printer according to claim 1, characterized in that: The first and second inclined frustums are arranged symmetrically.

3. The eccentric shaft for a printer according to claim 1, characterized in that: The outer diameters of the first eccentric part and the second eccentric part are the same.

4. The eccentric shaft for a printer according to claim 1, characterized in that: The right end face of the first inclined frustum tilts to the right from top to bottom.

5. The eccentric shaft for a printer according to claim 1, characterized in that: The left end face of the second truncated cone tilts to the left from top to bottom.

6. The eccentric shaft for a printer according to claim 1, characterized in that: The outer diameter of the first step portion is equal to the outer diameter of the third step portion, and the outer diameter of the second step portion is smaller than the outer diameter of the first step portion.

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